Key holder



FIG. 1 is a left side elevational view of a key holder showing my new design;

FIG. 2 is a front elevation thereof; and

FIG. 3 is a right side elevation thereof.

The broken line showing of keyrings in FIGS. 1 through 3 is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a key holder, as shown. 